c# - How to get row value by just giving column name in DataTable

C# - How to get row value by just giving column name in DataTable

To retrieve the value of a specific column from a DataTable in C# by providing the column name, you can use the DataRow object and its indexer properties. Here's a step-by-step guide on how to do this:

Steps:

  1. Access the DataRow: You first need to get the specific DataRow from the DataTable.
  2. Retrieve the Value: Use the column name to get the value from the DataRow.

Example Code

Here's a complete example demonstrating how to achieve this:

using System; using System.Data; class Program { static void Main() { // Create a DataTable and add columns DataTable table = new DataTable(); table.Columns.Add("Id", typeof(int)); table.Columns.Add("Name", typeof(string)); table.Columns.Add("Age", typeof(int)); // Add some rows to the DataTable table.Rows.Add(1, "Alice", 30); table.Rows.Add(2, "Bob", 25); table.Rows.Add(3, "Charlie", 35); // Example: Get the value of a specific column by column name string columnName = "Name"; foreach (DataRow row in table.Rows) { // Get the value from the column specified by columnName object value = row[columnName]; // Print the value Console.WriteLine(value); } } }

Explanation:

  1. Creating and Populating the DataTable:

    • We create a DataTable and add columns (Id, Name, Age).
    • Rows are added to the DataTable with values for each column.

  2. Accessing Row Values by Column Name:

    • We loop through each DataRow in the DataTable.
    • For each row, we access the value of the column specified by columnName using row[columnName].
    • The value is printed to the console.

Important Notes:

  • Column Name: Ensure the column name you provide matches exactly with one of the column names in the DataTable. Column names are case-sensitive.
  • Data Type: The value retrieved from row[columnName] is of type object. You might need to cast it to the appropriate type depending on the column's data type (e.g., string, int).

This method provides a flexible way to retrieve data from a DataTable when you know the column name but not the index.

Examples

  1. How to get a cell value by column name in DataTable in C#

    Description: This example shows how to access a specific cell value in a DataTable by providing the column name.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Name", typeof(string)); table.Columns.Add("Age", typeof(int)); table.Rows.Add("Alice", 30); table.Rows.Add("Bob", 25); string columnName = "Name"; int rowIndex = 1; string cellValue = table.Rows[rowIndex][columnName].ToString(); Console.WriteLine(cellValue); // Output: Bob } }

  2. C# DataTable get value by column name and row index

    Description: This code demonstrates how to retrieve a value from a DataTable by specifying the column name and the row index.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Product", typeof(string)); table.Columns.Add("Price", typeof(decimal)); table.Rows.Add("Laptop", 999.99m); table.Rows.Add("Tablet", 499.99m); string columnName = "Price"; int rowIndex = 0; decimal cellValue = (decimal)table.Rows[rowIndex][columnName]; Console.WriteLine(cellValue); // Output: 999.99 } }

  3. How to find row value in DataTable using column name in C#

    Description: This example shows how to find and retrieve a specific value from a DataTable using the column name and the row index.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("ID", typeof(int)); table.Columns.Add("Score", typeof(double)); table.Rows.Add(1, 95.5); table.Rows.Add(2, 88.0); string columnName = "Score"; int rowIndex = 1; double cellValue = (double)table.Rows[rowIndex][columnName]; Console.WriteLine(cellValue); // Output: 88.0 } }

  4. C# DataTable get cell value by column name

    Description: This code illustrates how to get the value of a cell from a DataTable by specifying the column name directly.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Employee", typeof(string)); table.Columns.Add("Department", typeof(string)); table.Rows.Add("John", "HR"); table.Rows.Add("Jane", "IT"); string columnName = "Department"; int rowIndex = 0; string cellValue = table.Rows[rowIndex][columnName].ToString(); Console.WriteLine(cellValue); // Output: HR } }

  5. How to get data from DataTable using column name in C#

    Description: This example demonstrates how to extract data from a DataTable by using the column name to access a specific cell value.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("City", typeof(string)); table.Columns.Add("Population", typeof(int)); table.Rows.Add("New York", 8419000); table.Rows.Add("Los Angeles", 3980000); string columnName = "Population"; int rowIndex = 1; int cellValue = (int)table.Rows[rowIndex][columnName]; Console.WriteLine(cellValue); // Output: 3980000 } }

  6. C# DataTable get row by column value

    Description: This code shows how to retrieve a DataRow from a DataTable by matching a specific column value.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Country", typeof(string)); table.Columns.Add("Capital", typeof(string)); table.Rows.Add("USA", "Washington"); table.Rows.Add("France", "Paris"); string columnName = "Country"; string searchValue = "France"; DataRow row = table.Select($"{columnName} = '{searchValue}'")[0]; string capital = row["Capital"].ToString(); Console.WriteLine(capital); // Output: Paris } }

  7. How to get specific column value from DataTable in C#

    Description: This example retrieves a specific column value from a DataTable by specifying the column name and the row index.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Fruit", typeof(string)); table.Columns.Add("Quantity", typeof(int)); table.Rows.Add("Apple", 50); table.Rows.Add("Banana", 30); string columnName = "Quantity"; int rowIndex = 0; int cellValue = (int)table.Rows[rowIndex][columnName]; Console.WriteLine(cellValue); // Output: 50 } }

  8. C# DataTable get value from specific column

    Description: This code demonstrates how to get a value from a specific column in a DataTable using the column name.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Item", typeof(string)); table.Columns.Add("Price", typeof(decimal)); table.Rows.Add("Chair", 49.99m); table.Rows.Add("Table", 89.99m); string columnName = "Price"; int rowIndex = 1; decimal cellValue = (decimal)table.Rows[rowIndex][columnName]; Console.WriteLine(cellValue); // Output: 89.99 } }

  9. How to access DataTable cell value by column name in C#

    Description: This example shows how to access a cell value in a DataTable by providing the column name.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Book", typeof(string)); table.Columns.Add("Author", typeof(string)); table.Rows.Add("1984", "George Orwell"); table.Rows.Add("Brave New World", "Aldous Huxley"); string columnName = "Author"; int rowIndex = 0; string cellValue = table.Rows[rowIndex][columnName].ToString(); Console.WriteLine(cellValue); // Output: George Orwell } }

  10. How to retrieve value from DataTable by column name in C#

    Description: This code retrieves a value from a DataTable by specifying the column name and the row index.

    Code:

    using System; using System.Data; public class Program { public static void Main() { DataTable table = new DataTable(); table.Columns.Add("Course", typeof(string)); table.Columns.Add("Duration", typeof(int)); table.Rows.Add("Math", 90); table.Rows.Add("Science", 120); string columnName = "Duration"; int rowIndex = 1; int cellValue = (int)table.Rows[rowIndex][columnName]; Console.WriteLine(cellValue); // Output: 120 } }

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