System.Data.DataTable column LENGTH increase

To increase the length, you need to set the MaxLength property value.

using System;
using System.Data;

class Program
{
    static void Main()
    {
        // Create a new DataTable.
        DataTable table = new DataTable("ExampleTable");

        // Add a new DataColumn.
        DataColumn column = new DataColumn("ExampleColumn", typeof(string));
        
        // Set the MaxLength to 593.
        column.MaxLength = 593;

        // Add the column to the DataTable.
        table.Columns.Add(column);

        // Now you can add rows with string values up to 593 characters long.
        DataRow row = table.NewRow();
        row["ExampleColumn"] = new string('a', 593); // Adding a string with 593 characters.
        table.Rows.Add(row);

        // now you can Display the length of the first row's column value.
    }
}

Hope this will help.