DataGridView: Unable to 'De-select' Cell

Question

I am having trouble removing the blue background from a DataGridView Cell (2 actually).

The DataGridViews have NO selected cells and NO CurrentCells (CurrentCellAddress = -1, -1),

Neither DataGridView is the ActiveControl, yet the Blue Background persists: one Cell in each.

See screenshot below in which the 'End' button is the active control.What does the blue background mean? How do I get rid of it? Both DGViews are ReadOnly.

Answer 1

Hi @Tony Hedge , Welcome to Microsoft Q&A,

You can clear selected cells using ClearSelection(). At the same time, modify the enable attribute so that it cannot be selected.

using System.Windows.Forms;

namespace xxx
{
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();

             // Set up the first DataGridView
             dataGridView1.ReadOnly = true;
             dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
             dataGridView1.AllowUserToAddRows = false; // Disable users from manually adding rows

             // Set up the second DataGridView
             dataGridView2.ReadOnly = true;
             dataGridView2.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
             dataGridView2.AllowUserToAddRows = false; // Disable users from manually adding rows


             //Add sample data for two DataGridViews
             // This assumes you already have a data source, otherwise you need to set the data source for the two DataGridViews
             // Just added some sample data here for demonstration purposes
             dataGridView1.Columns.Add("Column1", "Column1");
             dataGridView1.Columns.Add("Column2", "Column2");
             dataGridView1.Rows.Add(new object[] { "Data1", "Data2" });
             dataGridView1.Rows.Add(new object[] { "Data3", "Data4" });

             dataGridView2.Columns.Add("Column1", "Column1");
             dataGridView2.Columns.Add("Column2", "Column2");
             dataGridView2.Rows.Add(new object[] { "Data5", "Data6" });
             dataGridView2.Rows.Add(new object[] { "Data7", "Data8" });

             dataGridView1.Enabled = false; // Disable the first DataGridView
             dataGridView2.Enabled = false;
         }

         private void Form1_Load(object sender, System.EventArgs e)
         {
             dataGridView1.ClearSelection();
             dataGridView2.ClearSelection();
         }
     }
}

Best Regards,

Jiale

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Answer 2

Try to edit the DefaultCellStyle property of the grids (in Form Designer). Change the SelectionBackColor. Use a green colour that is used for your columns.