I want serch spcfic name on datagridviwe in C# without useing textbox combox or button only I m pressing keyboard key filter grid automatically is this possibale

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    for (int i = 0; i <(dataGridView2.Rows.Count); i++)

                {
                    if (dataGridView2.Rows[i].Cells["dt coulme name"].Value.ToString().StartsWith(typedChars, true, CultureInfo.InvariantCulture))
                    {
                        dataGridView2.Rows[i].Cells[0].Selected = true;
                        
                        return;

What I have tried:

i am trying to filter datagridview on keyboard keypress   i excute code on gridview keypress event but i cant please help me also give message when press another data which is not avilable so

Posted 30-Aug-22 0:10am

vaishali jadhav 2022

Updated 30-Aug-22 1:14am

v2

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Richard MacCutchan 30-Aug-22 6:12am

What is the actual problem?

vaishali jadhav 2022 30-Aug-22 6:29am

Actually I want to search a cell in a grid one by one when key presss so I execute upper 👆 code but when press another key like your name is Richard and I press Richards so that Time I want execute else part but it can't execute and show null exceptions errors

Richard MacCutchan 30-Aug-22 6:50am

Well unfortunately we cannot see the code you are referring to, nor can we see any of the error messages. If you want help with your problem then you need to provide full details in your question. Please do not expect us to guess what your code is doing and what errors occur.

vaishali jadhav 2022 1-Sep-22 4:38am

I m Trying your this code
public string typedChars = string.Empty; private void dataGridView1_KeyPress(object sender, KeyPressEventArgs e)
{ if(e.KeyCode == Keys.Left || e.KeyCode == Keys.Right || e.KeyCode == Keys.Up || e.KeyCode == Keys.Down) { typedChars = string.Empty; return; } if (Char.IsLetter(e.KeyChar)) { typedChars += e.KeyChar.ToString();
for (int i = 0; i < (dataGridView1.Rows.Count); i++)
{
if (dataGridView1.Rows[i].Cells["Name"].Value.ToString().StartsWith(typedChars, true, CultureInfo.InvariantCulture))
{
dataGridView1.Rows[i].Cells[0].Selected = true; return;
}
}
}
}

but when i excute else part get error or i comment else part so if i type another value which is not exist ge null exception error

Richard MacCutchan 1-Sep-22 4:43am

Please add that information (properly formatted) to your question.

vaishali jadhav 2022 1-Sep-22 6:18am

if (dataGridView2.Rows[i].Cells["LDG_FULLNAME"].Value.ToString().StartsWith(typedChars, true, CultureInfo.InvariantCulture))

error show in this line and error is "System.NullReferenceException: 'Object reference not set to an instance of an object.'"

Richard MacCutchan 1-Sep-22 6:28am

:sigh:
The message is telling yo that some portion of the expression dataGridView2.Rows[i].Cells["LDG_FULLNAME"].Value.ToString() does not return a valid object reference. So use the debugger to find out which part it is and why it fails.

vaishali jadhav 2022 1-Sep-22 7:05am

but when i am comment on else its serch name like richard its focus on name but when extra key i am press getting same error like i am serch rechard and also with press 's'

Richard MacCutchan 1-Sep-22 8:06am

We cannot help you because we have no access to your system. The only way to resolve this issue is to use the debugger to find out exactly what is happening when you run the code.

OriginalGriff 30-Aug-22 6:27am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with - we get no other context for your project.
Imagine this: you go for a drive in the country, but you have a problem with the car. You call the garage, say "it broke" and turn off your phone. How long will you be waiting before the garage arrives with the right bits and tools to fix the car given they don't know what make or model it is, who you are, what happened when it all went wrong, or even where you are?

That's what you've done here. So stop typing as little as possible and try explaining things to people who have no way to access your project!

Use the "Improve question" widget to edit your question and provide better information.

vaishali jadhav 2022 30-Aug-22 6:35am

Actually I want to search a cell in a grid one by one when key presss so I execute upper 👆 code but when press another key like your name is Richard and I press Richards so that Time I want execute else part but it can't execute and show null exceptions errors

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OriginalGriff · Answer 1 · 2022-08-30T01:14:00

Why not just use a filter? If you use a DataTable as the DataSource for the DGV, it has a DefaultView property which supports the RowFilter property:

(MyDataGridView.DataSource as DataTable).DefaultView.RowFilter = string.Format("Title LIKE '%{0}%'", filterString);

Then each time they type a character, add it to the filter string and set the filter
If you have a lot of rows, use a timer set to 1/4 second, and set a timeout each time they type:

     Timer updateFilter = new Timer();
     updateFilter.Interval = 250;
     updateFilter.Tick += UpdateFilter_Tick;
     updateFilter.Start();
     }

private void UpdateFilter_Tick(object sender, EventArgs e)
     {
     if (UpdateFilter >= DateTime.Now)
         {
         (ItemsDisplay.DataSource as DataTable).DefaultView.RowFilter = string.Format("Title LIKE '%{0}%'", TitleFilter.Text);
         UpdateFilter = DateTime.MinValue;
         }
     }
private void TitleFilter_TextChanged(object sender, EventArgs e)
     {
     if (sender is TextBox filter)
         {
         UpdateFilter = DateTime.Now.AddMilliseconds(500);
         }
     }