Remove all rows from datagridview except first

Question

Hello,

I wanted to remove all rows from datagridview in C# windows form application except the first row.
I tried with below code but It removes only few rows not all.

>     public static void ClearDataGridViewRows(DataGridView dataGridView)

>         {

>           foreach (DataGridViewRow row in dataGridView.Rows)

>           {

>             if (dataGridView.Rows.Count == 1) continue;

>             dataGridView.Rows.RemoveAt(dataGridView.Rows.Count - 1);

>           }

>         }

Answer 1

Hello,

Use a while statement e.g.

using System;  
using System.Windows.Forms;  
  
namespace DataGridViewCombo1  
{  
    public partial class Form2 : Form  
    {  
        public Form2()  
        {  
            InitializeComponent();  
        }  
  
        private void Form2_Load(object sender, EventArgs e)  
        {  
            dataGridView1.RowCount = 5;  
  
            for (int index = 0; index < dataGridView1.Rows.Count -1; index++)  
            {  
                dataGridView1.Rows[index].Cells[0].Value = index;  
            }  
        }  
  
        private void RemoveButton_Click(object sender, EventArgs e)  
        {  
            dataGridView1.AllowUserToAddRows = false;  
  
            try  
            {  
                while (dataGridView1.Rows.Count > 1)  
                {  
                    dataGridView1.Rows.RemoveAt(dataGridView1.Rows.Count - 1);  
                }  
            }  
            finally  
            {  
                dataGridView1.AllowUserToAddRows = true;  
            }  
        }  
    }  
}  
  

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Answer 2

The first row of the dataGridView is the header row.

Do you want to delete all data rows and keep only this header row?

If so, you can try the following code:

            var dt = dataGridView1.DataSource as DataTable;  
            dt.Rows.Clear();  
            dataGridView1.DataSource = dt;  

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