gridview validation only on 1,2 and 3 row out of 4 rows.In server side

To solve the problem and implement validation for the first, second, and third rows of the GridView, you can follow these steps:

1. In the code-behind file (e.g., .aspx.cs), handle the click event of the Submit button (Btn_Submit_Click).
2. Inside the event handler, iterate through the GridView rows and perform the validation for the desired rows.
3. You can use the FindControl method to access the TextBox controls within each row and retrieve their values for validation.
4. Apply the desired validation logic, such as checking for empty values or specific formats, for the required rows.
5. If any validation errors are found, you can display an error message or highlight the invalid rows.
6. If all the required rows pass the validation, you can proceed with the desired action, such as saving the data or performing further processing.

Here's an example of how you can implement the server-side validation for the first, second, and third rows of the GridView:

protected void Btn_Submit_Click(object sender, EventArgs e)
{
    // Iterate through the GridView rows
    for (int i = 0; i < gvAcademicQualification.Rows.Count; i++)
    {
        // Only perform validation for the first, second, and third rows
        if (i < 3)
        {
            GridViewRow row = gvAcademicQualification.Rows[i];

            // Find the TextBox controls within the row
            TextBox txtStream = (TextBox)row.FindControl("txtStream");
            TextBox txtInstituteName = (TextBox)row.FindControl("txtInstituteName");
            TextBox txtGrade = (TextBox)row.FindControl("txtGrade");
            TextBox txtYearOfPassing = (TextBox)row.FindControl("txtYearOfPassing");

            // Perform validation for the desired fields
            if (string.IsNullOrEmpty(txtStream.Text))
            {
                // Handle the validation error for Stream field
                // You can display an error message or highlight the invalid row
            }

            if (string.IsNullOrEmpty(txtInstituteName.Text))
            {
                // Handle the validation error for Institute Name field
                // You can display an error message or highlight the invalid row
            }

            if (string.IsNullOrEmpty(txtGrade.Text))
            {
                // Handle the validation error for Grade field
                // You can display an error message or highlight the invalid row
            }

            if (string.IsNullOrEmpty(txtYearOfPassing.Text))
            {
                // Handle the validation error for Year of Passing field
                // You can display an error message or highlight the invalid row
            }
        }
    }

    // Proceed with further processing if all required rows pass the validation
}

Make sure to replace the Btn_Submit_Click event handler with the actual event handler name used in your code.

if (e.Row.RowType == DataControlRowType.DataRow)

after Checking this condition it is not entering inside it.

it is going outside.

if (e.Row.RowType == DataControlRowType.DataRow)
{
    if (e.Row.RowIndex < 3)
    {
        // Apply validation to the first three rows
        TextBox txtStream = (TextBox)e.Row.FindControl("txtStream");
        TextBox txtInstituteName = (TextBox)e.Row.FindControl("txtInstituteName");
        TextBox txtGrade = (TextBox)e.Row.FindControl("txtGrade");
        TextBox txtYearOfPassing = (TextBox)e.Row.FindControl("txtYearOfPassing");

        // Add your validation logic here

        RequiredFieldValidator rtxtStream = FindControl("rtxtStream") as RequiredFieldValidator;
        RequiredFieldValidator rtxtInstituteName = FindControl("rtxtInstituteName") as RequiredFieldValidator;
        RequiredFieldValidator rtxtGrade = FindControl("rtxtGrade") as RequiredFieldValidator;
        RequiredFieldValidator rtxtYearOfPassing = FindControl("rtxtYearOfPassing") as RequiredFieldValidator;

        // Set the Visible property to false for the RequiredFieldValidators in the last row
        if (rtxtStream != null)
            rtxtStream.Visible = true;
        if (rtxtInstituteName != null)
            rtxtInstituteName.Visible = true;
        if (rtxtGrade != null)
            rtxtGrade.Visible = true;
        if (rtxtYearOfPassing != null)
            rtxtYearOfPassing.Visible = true;
    }

    if(e.Row.RowIndex == 3)
    {
        TextBox txtStream = (TextBox)e.Row.FindControl("txtStream");
        TextBox txtInstituteName = (TextBox)e.Row.FindControl("txtInstituteName");
        TextBox txtGrade = (TextBox)e.Row.FindControl("txtGrade");
        TextBox txtYearOfPassing = (TextBox)e.Row.FindControl("txtYearOfPassing");

        // validation logic

        RequiredFieldValidator rtxtStream = FindControl("rtxtStream") as RequiredFieldValidator;
        RequiredFieldValidator rtxtInstituteName = FindControl("rtxtInstituteName") as RequiredFieldValidator;
        RequiredFieldValidator rtxtGrade = FindControl("rtxtGrade") as RequiredFieldValidator;
        RequiredFieldValidator rtxtYearOfPassing = FindControl("rtxtYearOfPassing") as RequiredFieldValidator;

        // Set the Visible property to false for the RequiredFieldValidators in the last row
        if (rtxtStream != null)
            rtxtStream.Visible = false;
        if (rtxtInstituteName != null)
            rtxtInstituteName.Visible = false;
        if (rtxtGrade != null)
            rtxtGrade.Visible = false;
        if (rtxtYearOfPassing != null)
            rtxtYearOfPassing.Visible = false;

    }
}

To validate only the first three rows of a GridView on the server side, you can use the RowDataBound event. This event is triggered for each row when it’s bound to data. Inside this event, you can check the row index and apply validation only if the row index is less than 3 (since row indices start from 0). Here’s an example:

protected void gvAcademicQualification_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if (e.Row.RowIndex < 3)
        {
            // Apply validation to the first three rows
            TextBox txtStream = (TextBox)e.Row.FindControl("txtStream");
            TextBox txtInstituteName = (TextBox)e.Row.FindControl("txtInstituteName");
            TextBox txtGrade = (TextBox)e.Row.FindControl("txtGrade");
            TextBox txtYearOfPassing = (TextBox)e.Row.FindControl("txtYearOfPassing");

            // Add your validation logic here
        }
    }
}

In the above code, FindControl is used to access the TextBox controls in the GridView1. You can replace the comment // Add your validation logic here with your actual validation logic. Please note that this is a basic example and you might need to adjust it according to your specific requirements.

Remember to wire up this event handler to the OnRowDataBound event of your GridView in the ASPX markup:

Thanks