c# - No overload for 'Button1_Click' matches delegate 'System.EventHandler'? -

i want display values db grid view image file. while using given below code shows error. me find proper solution.

code:

 protected void button1_click(object sender, gridviewroweventargs e1)     {         shadinganalysisdatasettableadapters.tbl_sitelayoutuploadtableadapter sl;         sl = new shadinganalysisdatasettableadapters.tbl_sitelayoutuploadtableadapter();         datatable dt = new datatable();         dt = sl.getgriddata(ddlsit.selectedvalue, int.parse(ddlversion.selectedvalue));         try         {           if (e1.row.rowtype == datacontrolrowtype.datarow && gvedit.editindex == e1.row.rowindex)             {               image image1 = (image)e1.row.findcontrol("image1");               foreach (datarow row in dt.rows)                {                   byte[] img1 = (byte[])row["imgdata"];                   string base1 = convert.tobase64string(img1);                   image1.imageurl = "data:image/jpg;base64," + base1;                }           }             gvedit.datasource = dt;             gvedit.databind();         }         catch (nullreferenceexception ex)         {          }     } 

aspx:

 <asp:button id="button1" runat="server" text="submit" onclick="button1_click" /> 

you need change function prototype below:

 protected void button1_click(object sender, eventargs e1)  {  }